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• W2012188002 abstract "Homogeneous samples of La0.4Sr0.6CoO3-δ were obtained by the glycine nitrate process. The oxygen nonstoichiometry was determined from oxygen exchange measurements as a function of oxygen partial pressure (10−4 bar<PO2<10−2 bar) and temperature (300°C<T<900°C). The chemical diffusion coefficient D̃ was obtained from oxygen exchange measurements applying a stepwise variation of the oxygen partial pressure of the ambient atmosphere of a disk-shaped sample. The amount of oxygen absorbed or desorbed by the perovskite was analyzed as a function of time. Chemical diffusion data were evaluated using simplified and exact fitting procedures taking into account the surface exchange coefficient. Alternatively, galvanostatic polarization measurements were performed in a PO2-range between 10−4 and 10−2 bar to yield D̃ and the ionic conductivity σi from the long time solution of the diffusion equation. Values for D̃ from polarization measurements at T=775°C and from oxygen exchange measurements at T=725°C are in good agreement with each other. D̃ and σi increase with increasing PO2 (10−4 to 10−2 bar). The ionic conductivity shows a maximum at 3-δ≈2.82 and decreases with decreasing oxygen content indicating the possible formation of vacancy ordered structures." @default.
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• W2012188002 date "2001-09-01" @default.
• W2012188002 modified "2023-10-16" @default.
• W2012188002 title "Oxygen nonstoichiometry and ionic transport properties of La0.4Sr0.6CoO3-δ" @default.
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• W2012188002 doi "https://doi.org/10.1016/s1386-1425(01)00489-9" @default.
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